OPGW optical cable, also known as optical fiber composite overhead ground wire, is a fiber optic cable placed in the ground wire of the overhead high-voltage transmission line and installed on the top of the transmission line tower to form an optical fiber communication network on the transmission line. This structure has both ground wire and communication functions and is generally called OPGW optical cable.
OPGW optical cable is wrapped with metal conductors, making it more reliable, stable and strong. Since the overhead ground wire and the optical cable are combined into one, it can shorten the construction period and save construction costs compared with other optical cables. In addition, if OPGW made of aluminum-clad steel wire or aluminum alloy wire is used, it is equivalent to setting up a good conductor overhead ground wire, which can reduce the potential current of the transmission line, reduce the power frequency overvoltage, and improve the interference and dangerous impact of power lines on communication lines.
OPGW is suitable for lines with high voltage exceeding 110kv and a large span (generally above 250M); it is easy to maintain and easy to solve the problem of line spanning, and its mechanical characteristics can meet the requirements of large line spanning; the outer layer of OPGW is metal armor, which has no effect on high-voltage electrical corrosion and degradation; OPGW must be powered off during construction, and the power outage loss is large, so OPGW should be used in newly built high-voltage lines above 110kv; the optical fiber is made of glass fiber, which is easy to break and fragile.
During the construction process, the OPGW should be prevented from being pulled, abraded, sprained, pressed or broken, and the optical cable should be pulled smoothly without being squeezed.
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